Bump eu.maveniverse.maven.nisse:extension from 0.9.3 to 0.9.4 (#2998)

Bumps [eu.maveniverse.maven.nisse:extension](https://github.com/maveniverse/nisse) from 0.9.3 to 0.9.4.
- [Release notes](https://github.com/maveniverse/nisse/releases)
- [Commits](maveniverse/nisse@release-0.9.3...release-0.9.4)

---
updated-dependencies:
- dependency-name: eu.maveniverse.maven.nisse:extension
  dependency-version: 0.9.4
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.mvn/extensions.xml

@@ -3,6 +3,6 @@
   <extension>
     <groupId>eu.maveniverse.maven.nisse</groupId>
     <artifactId>extension</artifactId>
-    <version>0.9.3</version>
+    <version>0.9.4</version>
   </extension>
 </extensions>